diff --git a/htdocs/core/lib/json.lib.php b/htdocs/core/lib/json.lib.php
index 006010d61b7..dc87a04224a 100644
--- a/htdocs/core/lib/json.lib.php
+++ b/htdocs/core/lib/json.lib.php
@@ -28,188 +28,24 @@
  *
  * @param	mixed	$elements		PHP Object to json encode
  * @return 	string					Json encoded string
- * @deprecated Use json_encode.
+ * @deprecated Use json_encode native function
  */
 function dol_json_encode($elements)
 {
 	return json_encode($elements);
 }
 
-/**
- * Return text according to type
- *
- * @param 	mixed	$val	Value to show
- * @return	string			Formated value
- */
-function _val($val)
-{
-	if (is_string($val))
-	{
-        // STRINGS ARE EXPECTED TO BE IN ASCII OR UTF-8 FORMAT
-        $ascii = '';
-        $strlen_var = strlen($val);
-
-        /*
-	     * Iterate over every character in the string,
-	     * escaping with a slash or encoding to UTF-8 where necessary
-	     */
-	    for ($c = 0; $c < $strlen_var; ++$c) {
-
-	        $ord_var_c = ord($val{$c});
-
-	        switch (true) {
-	            case $ord_var_c == 0x08:
-	                $ascii .= '\b';
-	                break;
-	            case $ord_var_c == 0x09:
-	                $ascii .= '\t';
-	                break;
-	            case $ord_var_c == 0x0A:
-	                $ascii .= '\n';
-	                break;
-	            case $ord_var_c == 0x0C:
-	                $ascii .= '\f';
-	                break;
-	            case $ord_var_c == 0x0D:
-	                $ascii .= '\r';
-	                break;
-
-	            case $ord_var_c == 0x22:
-	            case $ord_var_c == 0x2F:
-	            case $ord_var_c == 0x5C:
-	                // double quote, slash, slosh
-	                $ascii .= '\\'.$val{$c};
-	                break;
-
-	            case (($ord_var_c >= 0x20) && ($ord_var_c <= 0x7F)):
-	                // characters U-00000000 - U-0000007F (same as ASCII)
-	                $ascii .= $val{$c};
-	                break;
-
-	            case (($ord_var_c & 0xE0) == 0xC0):
-	                // characters U-00000080 - U-000007FF, mask 110XXXXX
-	                // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
-	                $char = pack('C*', $ord_var_c, ord($val{$c + 1}));
-	                $c += 1;
-	                $utf16 = utf82utf16($char);
-	                $ascii .= sprintf('\u%04s', bin2hex($utf16));
-	                break;
-
-	            case (($ord_var_c & 0xF0) == 0xE0):
-	                // characters U-00000800 - U-0000FFFF, mask 1110XXXX
-	                // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
-	                $char = pack('C*', $ord_var_c, ord($val{$c + 1}), ord($val{$c + 2}));
-	                $c += 2;
-	                $utf16 = utf82utf16($char);
-	                $ascii .= sprintf('\u%04s', bin2hex($utf16));
-	                break;
-
-	            case (($ord_var_c & 0xF8) == 0xF0):
-	                // characters U-00010000 - U-001FFFFF, mask 11110XXX
-	                // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
-	                $char = pack('C*', $ord_var_c, ord($val{$c + 1}), ord($val{$c + 2}), ord($val{$c + 3}));
-	                $c += 3;
-	                $utf16 = utf82utf16($char);
-	                $ascii .= sprintf('\u%04s', bin2hex($utf16));
-	                break;
-
-	            case (($ord_var_c & 0xFC) == 0xF8):
-	                // characters U-00200000 - U-03FFFFFF, mask 111110XX
-	                // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
-	                $char = pack('C*', $ord_var_c, ord($val{$c + 1}), ord($val{$c + 2}), ord($val{$c + 3}), ord($val{$c + 4}));
-	                $c += 4;
-	                $utf16 = utf82utf16($char);
-	                $ascii .= sprintf('\u%04s', bin2hex($utf16));
-	                break;
-
-	            case (($ord_var_c & 0xFE) == 0xFC):
-	                // characters U-04000000 - U-7FFFFFFF, mask 1111110X
-	                // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
-	                $char = pack('C*', $ord_var_c, ord($val{$c + 1}), ord($val{$c + 2}), ord($val{$c + 3}), ord($val{$c + 4}), ord($val{$c + 5}));
-	                $c += 5;
-	                $utf16 = utf82utf16($char);
-	                $ascii .= sprintf('\u%04s', bin2hex($utf16));
-	                break;
-	        }
-	    }
-
-	    return '"'.$ascii.'"';
-	}
-	elseif (is_int($val)) return sprintf('%d', $val);
-	elseif (is_float($val)) return sprintf('%F', $val);
-	elseif (is_bool($val)) return ($val ? 'true' : 'false');
-	else  return 'null';
-}
-
 /**
  * Implement json_decode for PHP that does not support it
  *
  * @param	string	$json		Json encoded to PHP Object or Array
  * @param	bool	$assoc		False return an object, true return an array. Try to always use it with true !
  * @return 	mixed				Object or Array
+ * @deprecated Use json_decode native function
  */
 function dol_json_decode($json, $assoc=false)
 {
-	$comment = false;
-
-    $out='';
-	$strLength = strlen($json);    // Must stay strlen and not dol_strlen because we want technical length, not visible length
-	for ($i=0; $i<$strLength; $i++)
-	{
-		if (! $comment)
-		{
-			if (($json[$i] == '{') || ($json[$i] == '[')) $out.= 'array(';
-			else if (($json[$i] == '}') || ($json[$i] == ']')) $out.= ')';
-			else if ($json[$i] == ':') $out.= ' => ';
-			else $out.=$json[$i];
-		}
-		else $out.= $json[$i];
-		if ($json[$i] == '"' && $json[($i-1)]!="\\") $comment = !$comment;
-	}
-
-	$out=_unval($out);
-
-	// Return an array
-	if ($out != '') eval('$array = '.$out.';');
-	else $array=array();
-
-	// Return an object
-	if (! $assoc)
-	{
-		if (! empty($array))
-		{
-			$object = false;
-
-			foreach ($array as $key => $value)
-			{
-				$object->{$key} = $value;
-			}
-
-			return $object;
-		}
-
-		return false;
-	}
-
-	return $array;
-}
-
-/**
- * Return text according to type
- *
- * @param 	mixed	$val	Value to decode
- * @return	string			Formated value
- */
-function _unval($val)
-{
-	while (preg_match('/\\\u([0-9A-F]{2})([0-9A-F]{2})/i', $val, $reg))
-	{
-	    // single, escaped unicode character
-	    $utf16 = chr(hexdec($reg[1])) . chr(hexdec($reg[2]));
-	    $utf8  = utf162utf8($utf16);
-	    $val=preg_replace('/\\\u'.$reg[1].$reg[2].'/i',$utf8,$val);
-	}
-	return $val;
+	return json_decode($json, $assoc);
 }
 
 /**